18 Celebs Who Guest Starred On Their Significant Other's TV Show

Lots of co-stars wind up dating the people they share a screen with, but there are plenty of times when the exact opposite happens. On occasion, television stars will get to share the screen with their current significant other when they are brought onto the show for a guest spot or, if they're lucky, a longer recurring role. So what guest appearances by a TV star's significant other were the most memorable?